tiny-url-ex/service/user/user.go

package user

import (
	"net/http"

	"git.xdrm.io/go/aicra"
	"git.xdrm.io/go/aicra/api"
	"git.xdrm.io/go/tiny-url-ex/service/model"
	"github.com/jinzhu/gorm"
)

// Service to manage users
type Service struct {
	DB *gorm.DB
}

// Wire services to their paths
func (s Service) Wire(server *aicra.Server) {
	if !s.DB.HasTable(&model.User{}) {
		s.DB.CreateTable(&model.User{})
	}

	server.Handle(http.MethodGet, "/users", s.getAllUsers)
	server.Handle(http.MethodGet, "/user/{id}", s.getUserByID)
	server.Handle(http.MethodPost, "/user", s.createUser)
	server.Handle(http.MethodPut, "/user/{id}", s.updateUser)
	server.Handle(http.MethodDelete, "/user/{id}", s.deleteUser)
}

func (s Service) getAllUsers(req api.Request, res *api.Response) api.Error {
	users := make([]model.User, 0)
	s.DB.Find(&users)
	res.SetData("users", users)
	return api.ErrorSuccess
}
func (s Service) getUserByID(req api.Request, res *api.Response) api.Error {
	id, err := req.Param.GetUint("user_id")
	if err != nil {
		return api.ErrorInvalidParam
	}

	var user model.User
	if s.DB.First(&user, id).RecordNotFound() {
		return api.ErrorNoMatchFound
	}

	res.SetData("id", user.ID)
	res.SetData("username", user.Username)
	res.SetData("firstname", user.Firstname)
	res.SetData("lastname", user.Lastname)
	res.SetData("articles", user.Articles)
	return api.ErrorSuccess
}

func (s Service) createUser(req api.Request, res *api.Response) api.Error {
	var user model.User
	var err error
	user.Username, err = req.Param.GetString("username")
	if err != nil {
		return api.ErrorInvalidParam
	}
	user.Firstname, err = req.Param.GetString("firstname")
	if err != nil {
		return api.ErrorInvalidParam
	}
	user.Lastname, err = req.Param.GetString("lastname")
	if err != nil {
		return api.ErrorInvalidParam
	}

	s.DB.Create(&user)
	if s.DB.Last(&user).RecordNotFound() {
		return api.ErrorNoMatchFound
	}

	res.SetData("id", user.ID)
	res.SetData("username", user.Username)
	res.SetData("firstname", user.Firstname)
	res.SetData("lastname", user.Lastname)
	res.SetData("articles", user.Articles)
	return api.ErrorSuccess
}

func (s Service) updateUser(req api.Request, res *api.Response) api.Error {
	id, err := req.Param.GetUint("user_id")
	if err != nil {
		return api.ErrorInvalidParam
	}

	var user model.User
	if s.DB.First(&user, id).RecordNotFound() {
		return api.ErrorNoMatchFound
	}

	// override with updated values
	if updated, err := req.Param.GetString("username"); err == nil {
		user.Username = updated
	}
	if updated, err := req.Param.GetString("firstname"); err == nil {
		user.Firstname = updated
	}
	if updated, err := req.Param.GetString("lastname"); err == nil {
		user.Lastname = updated
	}

	// update
	if s.DB.Save(&user).RowsAffected < 1 {
		return api.ErrorFailure
	}
	return api.ErrorSuccess
}

func (s Service) deleteUser(req api.Request, res *api.Response) api.Error {
	id, err := req.Param.GetUint("user_id")
	if err != nil {
		return api.ErrorInvalidParam
	}

	user := model.User{}
	user.ID = id
	s.DB.Delete(&user)
	return api.ErrorSuccess
}